add release procedure doc
add release procedure doc

blaze/dask,blaze/dask,dask/dask,mrocklin/dask,ContinuumIO/dask,jcrist/dask,jcrist/dask,gameduell/dask,ContinuumIO/dask,dask/dask,cpcloud/dask,mrocklin/dask,cowlicks/dask,mraspaud/dask,pombredanne/dask,vikhyat/dask,jakirkham/dask,vikhyat/dask,chrisbarber/dask,pombredanne/dask,mraspaud/dask,mikegraham/dask,jakirkham/dask